Calculating apparatus



Oct. 7, 1930. H.. Fuss lCALCULM'ING APPARATUS Filed April 20, 1925 Patented Oct. A,7, 1930 UNITED STATES HERBERT FUSS, F NEUBABELSBABG, NEAR BERLIN, GERMANY CALCULATING APPARATUS Application led April 20, 1925, Serial No. 24,481, and in Germany April 29, 1924.

in reading the result of a calculation and which operates accurately.`

In the drawings aixed to this specification and ormin part thereof, two forms of an apparatus em odying my invention are illustrated diagrammatically by way of exam le.

n the drawings.: Figs. 1 to 3 illustrate a calculating appai ratus equipped with bands fixed by their ends,

Fig. 1 being a plan view,

Fig. 2 a section on the line 2 2 in Fig. 1,

and

Fig. 3 being a section on the line 3 3 in g Fig. 2.

Figs. 4 to 6 illustrate a calculating apparatus equipped with endless bands,

Fig. 4 being a plan View,

Fig. 5 a section on the line 5-5 in Fig. 6, and

Fig. 6 being a section on the line. 6-6 in Fig. 5.

Referring first to Figs. 1 to 4, 1 is a preferably rectangular casing, the top of which has an opening. A plate or window .2 of transparent material is arranged beneath the opening and held by a frame 2 and screws or rivets 39. Y Y

3 is a spindle arranged beneath the central line of the plate 2, and 4, 5 are two drums, mounted on the spindle, the drum 4 being fixed and the drum 5 being rotatable thereon. An operating knob or handle 7 is secured on one end of the spindle which rojects from the casing 1. A boss or hub o the free drum 5 projects from the opposite side of the casing, and a knob 10 is secured to this boss by pins 9. A threaded end 11 of the spindle 3 projects beyond the knob 10 anda n ut 13 is screwed on the thread 12. 16, 17 and 18 are washers inserted lbetween the 4 and V5 and the walls of the casing 1,

respectively, 14 and 15 are teeth in the form of pins having rounded ends which project from the circumferential faces or peripheries of the drums 4 and 5, midway between their edges. In this instance each drum is equipped with twelve pins but it will be understood that the number of pins may vary.

19 and 20 are journals arranged at the ends of the casing 1, and extending parallel to the spindle 3 and being secured against rotation b nuts 21, 22 and 23, 24, respectively, at oth ends. 25, 26 and 27, 28 are pairs of drums, and are mounted on the pins 19 and 20, respectively, for rotation against the action of spiral springs, 35, respectively, which are secured to the journals at 19 and to the drums at 36. Washers 29 and 30 are inserted between the drums The drums 25, 26, 27 and 28 are provided l with flanges at both ends, and bands on which a logarithmic graduation is imprinted,

. are secured to, one of the drums at either end and pass over the drums on the spindle 3. In the instance shown in the drawing, two such bands are provided, the band carried by the drums 26, 4 and 28 and securedy to the drums 26 and 28 at 37 and 37', respectively, being shown in Fig. 2. The bands have central rows of perforations adapted to cooperate with the teeth 14, 15on the drums 4 and 5 in feeding the bands. Grooves V40 formed-inthe plate permit the ends of the teeth 14, 15 and, if necessary, part of theV drums 4, 5 to travel past the plate. A mark 41 on the plate extends parallel to the axis of the spindle 3.

In operation the nut 13 is unscrewed so that the drum 5 can be rotated independently of the drum 4, and-theband not shown carried on the drums 25, 5 and 27 'can be set in relation to the band 60 on the drums 26, 4, and 28 which remains stationary. When the bands have been adjusted as desired, the nut 13 is drawn tight so that both bands now move in unison 'when the spindle 3 is ro- Atated by means of the knob 7 or 10, and the resultY of the calculation can be read below the mark 41. As mentioned, any suitable means apart from the clamping device exerting axial pressure on the drums may be used for positively connecting these drums, and the means for effecting such connection do not per se constitute a part of the present invention. The spiral springs inthe drums tend to wind the bands on the respective drums so that tension is put on the springs by unwinding the bands.

4In the modification shownin Figs. 4 to 6 such arts as correspond to those of the Y device a ove described are marked with the Ititi same reference numerals to which the index a is affixed. Here, the bands, one of which is indicated at a, are endless vand slung around drums 4a, 5a, and sets of drums 42, 43, 44, 45, 46, 47, 48, and 49 which are mounted for free rotation on journals 50, 51, 52, 53, 54, 55, 56 and 57 extending across the casing 1L parallel to the spindle 3a secured by nuts 58 and 59 at opposite sides of the casing. Each journal supports av pair of drums as will be seen in Fig. 6. The object of arranging so many drums is to enable bands of considerable length to be employed. c

The bands on the'drums 4a and 5a can be fed with regard to one another after the nut 13a has been unscrewed, and fed in unison by rotating the knob 7a or l0a after the nut 13*1 has been set,as described with reference to Figs.` l to 4, whereupon the result can be read below the mark 4la on the plate 2a` I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described, for obvious Inodilications will occur to a person` skilled in the art. Any number of bands 60 or 60fi maybe arranged in parallel on a corresponding number 'of drums.

I claim 1n a calculator of the slide rule typewherein adjacent bands having mutually cooperating graduations are trained over Vdrums arranged within a casing and a reading opening is provided i'n the casing adjacent to a pair of' intermediate manually operable drums, a plurality of radially projecting pins arranged on the periphery of each operating drum centrally 'between its ends; said bands each having a central row of perforations co-acting with the said pins A to prevent the bands from slipping, the arran ement being such that accurate relative rea ings may be taken from adjacent edges of the bands.

In testimonyl whereof I 'affix my signature.

HERBERT FUSS. 

